#include<myheader_c_plus.h>
using namespace std;
int main()
{
    try{
        cout << "plz input two nums" << endl;
        int a,b;
        cin >> a >> b;
        if(b == 0){
            //throw runtime_error("b 0!");
        }
        float res = a/b;
        cout << res << endl;
    }
    catch (const exception& e){
        cerr << "caught an exception:" << e.what() << endl;
    }
    return 0;
}

